Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cua triet, dua tren
cay dua » chay dua, cay lua, ca dua
van cay » van cau, van bay, van ca
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
cuu tre » cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky sang) OR (ky dang)) ma hoa. hieu van cay dua ban thanh vai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky dang)) ma hoa. hieu van cay dua ban thanh vai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) OR (ky dang)) ma hoa. hieu van cay dua ban thanh vai ((cua tre) or (cuu tre))*".